One day after the U.S. Postal Service abruptly changed course and announced it would keep delivering mail on Saturdays, a top House Republican has scheduled a hearing to examine the agency’s motivations.

“The Postal Service’s decision to first pursue modified Saturday delivery and then renege on its cost-cutting plan has seriously set back efforts to advance postal reform legislation,” said Rep. Darrell Issa, California Republican and chairman of the House Oversight and Government Reform Committee. “This hearing will allow us to review a wide variety of options to bring the troubled agency back from insolvency.

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The hearing will be held Wednesday, April 17, at 9:30 a.m.

On Wednesday, the USPS Board of Governors announced that it would continue regular Saturday deliveries, which had been on the chopping block as part of the agency’s plan to cut its annual multi billion-dollar shortfalls.

But the board said that language in the latest continuing budget resolution, funding the federal government through Sept. 30, prevents it from making the change. The specific language, crafted by Congress in the 1980s, calls for six-days-per-week service.

Mr. Issa has suggested that it was political pressure from labor unions and others that drove the decision, not the legislative language.